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07-15-2002, 11:21 PM
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#1 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Please help with late model Q jet problem...
I picked up a "new" Holley rebuilt quadrajet from a board member and its not really what I was expecting. I was going to use it on my new motor but I don't know if I can or not. I'm not too well versed in late model Qjets but this appears to be a computer controlled carb. does anyone have any idea what the electrical connections are on this thing? Are they mixture controls or will it function without them being connected. I think one of the hookups is a throttle positioning sensor but I have no idea what the other one is. If they are just feedback circuits to the computer to control spark advance I assume I can use the carb as is. If they are mixture contol selenoids then I am screwed. Anyone have a guess? The numbers on the carb are
17082253 1562 DTK
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No truck :-( |
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07-15-2002, 11:21 PM
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#2 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Heres the front
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No truck :-( |
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07-15-2002, 11:33 PM
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#3 | |
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Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,283
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that looks kind of like the carb on the 74, but i dont really know... heres a link that might help
http://www.holley.com
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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07-15-2002, 11:59 PM
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#4 |
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Senior Member
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,976
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It looks like the standard connector for the computer-controlled Q-jet. It has electronic metering.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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07-16-2002, 12:21 AM
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#5 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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So I'm screwed. Great!
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No truck :-( |
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07-16-2002, 12:23 AM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Take it back?
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07-16-2002, 12:35 AM
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#7 |
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"See the U.S.A....."
Join Date: Apr 2002
Location: Richmond TX.
Posts: 269
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Deffinetly give it back! Those electronic feedback carbs suck even when they are on the proper vehicle.
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1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston) |
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07-16-2002, 12:45 AM
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#8 |
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Registered User
Join Date: Aug 2001
Location: Long Beach, Ca
Posts: 1,432
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Put an Edel on it and be done with it. Q-jets were the worst carb ever built. When I had my parts house, I had a carb rebuilder. He built carbs all day long, we had more Q-jet parts than any other carb. They were a pain to rebuild and a pain to get running right.
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71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A> |
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07-16-2002, 01:03 AM
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#9 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Iv'e had a dozen or more carters over the years and theyre good carbs but I'm building this more for mileage and the edelbrock ( carter ) is not as good as a spread bore quad in good tune for mileage. Obviosly this one isnt what I am looking for but Quads arent that hard to tune. Theyre not evil but theyre really not that difficult to work on either.
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No truck :-( |
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07-16-2002, 01:07 AM
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#10 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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it will run, but those carbs are POS....I had a 83 cutlass for a while that had the computer controlled carb and dizzy, sh!tcanned the dizzy, put in a regular HEI and disconnected the wires from the carb, the electronics control the fuel suply to the primary jets, but when they have no power to them, the fuel is wide open.
It will run, but you won't be happy with the performance of it.....my advise is to get rid of the carb, and go with a correct QJ, or edelbrock.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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07-16-2002, 10:47 AM
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#11 |
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CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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Depends on want you want,and how much you like to work on carbs. The only thing different about that carb is it had a computer controlled enrichment circut to make up for the fact the to pass emissions they ran them so lean they would barley run. You can make it work on a "regular" motor and it even has one advantage. First the air valve has a stop that must be ground off to get full airflow. From the looks of that picture it might have allready been done. Second that carb has an adustment on the metering rods for adjustment that is pretty cool. I would stick it on your motor and see how it runs. From the looks of the picture it has been modified, I don't think it is legal for Holley to sell a computer controlled carb in that condition will all the anti-tamper plugs removed. Check out this link it might help.
http://duzy.8m.com/monte/ccquadrajet.htm
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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